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   1  <?php
   2  /**
   3   * A simple set of functions to check our version 1.0 update service
   4   *
   5   * @package WordPress
   6   * @since 2.3
   7   */
   8  
   9  /**
  10   * wp_version_check() - Check WordPress version against the newest version.
  11   *
  12   * The WordPress version, PHP version, and Locale is sent. Checks against the WordPress server at 
  13   * api.wordpress.org server. Will only check if PHP has fsockopen enabled and WordPress isn't installing.
  14   *
  15   * @package WordPress
  16   * @since 2.3
  17   * @uses $wp_version Used to check against the newest WordPress version.
  18   *
  19   * @return mixed Returns null if update is unsupported. Returns false if check is too soon.
  20   */
  21  function wp_version_check() {
  22      if ( !function_exists('fsockopen') || strpos($_SERVER['PHP_SELF'], 'install.php') !== false || defined('WP_INSTALLING') )
  23          return;
  24  
  25      global $wp_version;
  26      $php_version = phpversion();
  27  
  28      $current = get_option( 'update_core' );
  29      $locale = get_locale();
  30  
  31      if (
  32          isset( $current->last_checked ) &&
  33          43200 > ( time() - $current->last_checked ) &&
  34          $current->version_checked == $wp_version
  35      )
  36          return false;
  37  
  38      $new_option = '';
  39      $new_option->last_checked = time(); // this gets set whether we get a response or not, so if something is down or misconfigured it won't delay the page load for more than 3 seconds, twice a day
  40      $new_option->version_checked = $wp_version;
  41  
  42      $http_request  = "GET /core/version-check/1.0/?version=$wp_version&php=$php_version&locale=$locale HTTP/1.0\r\n";
  43      $http_request .= "Host: api.wordpress.org\r\n";
  44      $http_request .= 'Content-Type: application/x-www-form-urlencoded; charset=' . get_option('blog_charset') . "\r\n";
  45      $http_request .= 'User-Agent: WordPress/' . $wp_version . '; ' . get_bloginfo('url') . "\r\n";
  46      $http_request .= "\r\n";
  47  
  48      $response = '';
  49      if ( false !== ( $fs = @fsockopen( 'api.wordpress.org', 80, $errno, $errstr, 3 ) ) && is_resource($fs) ) {
  50          fwrite( $fs, $http_request );
  51          while ( !feof( $fs ) )
  52              $response .= fgets( $fs, 1160 ); // One TCP-IP packet
  53          fclose( $fs );
  54  
  55          $response = explode("\r\n\r\n", $response, 2);
  56          $body = trim( $response[1] );
  57          $body = str_replace(array("\r\n", "\r"), "\n", $body);
  58  
  59          $returns = explode("\n", $body);
  60  
  61          $new_option->response = $returns[0];
  62          if ( isset( $returns[1] ) )
  63              $new_option->url = $returns[1];
  64      }
  65      update_option( 'update_core', $new_option );
  66  }
  67  
  68  add_action( 'init', 'wp_version_check' );
  69  
  70  ?>